Improvement in adjustable seats



N.PETERS, PHOI'ULITNOGRAPHER. WASHINGTON. D. C.

NITED STATES PATENT OFFICE..`

LoUIs rosTAwKA, or EAST CAMBRIDGE, MASSACHUSETTS.

IMPROVEMENT IN ADJUSTABLE SEATS.

To a/ZZ whom it may concern.-

Be it known that I, LoUIs PosTAwKA, of East Cambridge,in the county of Middlesex and' State of Massachusetts, have invented a new and useful Improvement in Adjustable Seats 5 and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this speciication.

This invention relates to a new and useful improvement in seats for pianos and other purposes, and it consists in making the seat adj ustable as to height in the manner hereinafterV described.

In the accompanying drawings, Figure l represents a sectional side elevation on the line a: a: of Fig. 2. Fig. 2 is a horizontal of Fig. l,` taken on the line y y.

Similar letters of reference indicate corresponding parts.

A is the upholstered seat, to which is attached the screw-pieces a a.

B B are bars which slide on the under side y of the seat.`

C C represent one pair of the supportinglegs, (two pairs being used for supporting the seat.) The bars B B are pivoted to the top ends of the legs at the points marked D. The legs C C are jointedtogether at E. The height of the seat is governed by the position of the legs C C in relation to each other. i

`It will be seen that if the top ends of the legs are moved toward each other, or they are brought near to an upright position, the seat will be raised, and vice versa. This movement ofthe legs is produced by a right-and-lefthand screw, F, which is supported beneath the seat and parallel therewith by the pieces a a.

Specification forming part of Letters Patent No. 113,342, dated April 4, 1571i.

G G are screw-nuts on the bars B B, one being right and the other left handed to Suit the threads cut on the screw F. p

H H are disks or hand-wheels on theends of the screws, by means of which the screw is revolved and the adjustment made.

I I are guide-rods, of either wood or metal, attached at each end to the under` side of the seat by wire hangers or screw-eyes, as seen at J. The bars B B slide on these rods. rIhe guide-rods pass through the cross-pin K, which latter is fast to the bottom of the seat, and the rods are made fast therein, so that they have no longitudinal motion. The pairs of supporting-legs are connected together by rounds, as

as new and desire to secure by Letters Patent- The jointed legs C C, bars B B, screw F, and guide-rods I I, constructed and arranged to operate substantiallyas and for the purposes described.y

. The above specification of my invention signed by me this 21st day of February, 1871.

LOUIS .POSTAWKA- Viitnesses:

GEO. W. MABEE, T..B. MosnER. 

